ROCKER

noun Date: 1760 1. either of two curving pieces of wood or metal on which an object (as a cradle) rocks, any of various objects (as a rocking chair or an infant's toy having a seat placed between side pieces) that rock on ~s, any of various objects in the form of a ~ or with parts resembling a ~ (as a skate with a curved blade), d. any of the curved stripes at the lower part of a chevron worn by a noncommissioned officer above the rank of sergeant, the curved stripe at the upper part of a chevron worn by a chief petty officer, any of various devices that work with a rocking motion, a rock performer, song, or enthusiast